Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures consisting of triangles, squares, and parallelograms are used to construct the given shape. This tangram depicts a parrot fish.

Parrot Fish

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Regular pentagon inscribed in a circle, circumscribed about a circle.

Pentagon Inscribed & Circumscribed in Circles

Regular pentagon inscribed in a circle, circumscribed about a circle.

Illustration of a how to construct a pentagon similar to two given pentagons.

Pentagon Constructed to be Similar to Given Pentagons

Illustration of a how to construct a pentagon similar to two given pentagons.

Illustration of an irregular pentagon. This is also an example of a concave polygon with symmetry.

Irregular Concave Pentagon

Illustration of an irregular pentagon. This is also an example of a concave polygon with symmetry.

Illustration of an irregular concave pentagon.

Irregular Concave Pentagon

Illustration of an irregular concave pentagon.

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Irregular Convex Pentagon

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Irregular Convex Pentagon

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Illustration of an irregular convex pentagon.

Irregular Convex Pentagon

Illustration of an irregular convex pentagon.

Illustration of 2 concentric pentagons.

2 Concentric Pentagons

Illustration of 2 concentric pentagons.

Illustration of 2 concentric pentagons.

2 Concentric Pentagons

Illustration of 2 concentric pentagons.

Illustration of 2 regular congruent pentagons that have the same center. One pentagon has been rotated 36° in relation to the other.

2 Congruent Rotated Pentagons

Illustration of 2 regular congruent pentagons that have the same center. One pentagon has been rotated…

Illustration of 3 concentric pentagons that are equally spaced.

3 Concentric Pentagons

Illustration of 3 concentric pentagons that are equally spaced.

Illustration of 4 concentric pentagons that are equally spaced.

4 Concentric Pentagons

Illustration of 4 concentric pentagons that are equally spaced.

Illustration of 4 regular congruent pentagons that have the same center. Each pentagon has been rotated 18° in relation to the one next to it.

4 Congruent Rotated Pentagons

Illustration of 4 regular congruent pentagons that have the same center. Each pentagon has been rotated…

Illustration of 8 regular congruent pentagons that have the same center. Each pentagon has been rotated 9° in relation to the one next to it.

8 Congruent Rotated Pentagons

Illustration of 8 regular congruent pentagons that have the same center. Each pentagon has been rotated…

Illustration showing two congruent pentagons.

Congruent Pentagons

Illustration showing two congruent pentagons.

Draw the plan and elevation of a polygon of which the real shape and position in a given plane are known.

Draw Polygon

Draw the plan and elevation of a polygon of which the real shape and position in a given plane are known.

Polygon consisting of 10 sides

10-sided Polygon

Polygon consisting of 10 sides

Polygon consisting of 11 sides

11-sided Polygon

Polygon consisting of 11 sides

Polygon consisting of 12 sides

12-sided Polygon

Polygon consisting of 12 sides

Polygon consisting of 13 sides

13-sided Polygon

Polygon consisting of 13 sides

Polygon consisting of 14 sides

14-sided Polygon

Polygon consisting of 14 sides

Polygon consisting of 15 sides

15-sided Polygon

Polygon consisting of 15 sides

Polygon consisting of 16 sides

16-sided Polygon

Polygon consisting of 16 sides

Polygon consisting of 17 sides

17-sided Polygon

Polygon consisting of 17 sides

Polygon consisting of 18 sides

18-sided Polygon

Polygon consisting of 18 sides

Polygon consisting of 19 sides

19-sided Polygon

Polygon consisting of 19 sides

Polygon consisting of 20 sides

20-sided Polygon

Polygon consisting of 20 sides

Polygon consisting of 21 sides

21-sided Polygon

Polygon consisting of 21 sides

Polygon consisting of 22 sides

22-sided Polygon

Polygon consisting of 22 sides

Polygon consisting of 23 sides

23-sided Polygon

Polygon consisting of 23 sides

Polygon consisting of 24 sides

24-sided Polygon

Polygon consisting of 24 sides

Polygon consisting of 3 sides

3-sided Polygon

Polygon consisting of 3 sides

Polygon consisting of 4 sides

4-sided Polygon

Polygon consisting of 4 sides

Polygon consisting of 5 sides

5-sided Polygon

Polygon consisting of 5 sides

Polygon consisting of 6 sides

6-sided Polygon

Polygon consisting of 6 sides

Polygon consisting of 7 sides

7-sided Polygon

Polygon consisting of 7 sides

Polygon consisting of 8 sides

8-sided Polygon

Polygon consisting of 8 sides

Polygon consisting of 9 sides

9-sided Polygon

Polygon consisting of 9 sides

Illustration of a concave polygon. A concave polygon is a polygon of which tow or more sides, if produced, will enter the polygon.

Concave Polygon

Illustration of a concave polygon. A concave polygon is a polygon of which tow or more sides, if produced,…

Illustration of a convex polygon. A polygon is convex when no side when produced will enter the polygon.

Convex Polygon

Illustration of a convex polygon. A polygon is convex when no side when produced will enter the polygon.

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Crossed Polygon

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Crossed Polygon

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Crossed Polygon

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Crossed Polygon

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Illustration of a polygon with a diagonal drawn. A diagonal of a polygon is a line joining the vertices of two angles not adjacent (AC).

Polygon With Diagonal

Illustration of a polygon with a diagonal drawn. A diagonal of a polygon is a line joining the vertices…

1/10 of a 10 sided polygon

Fractions of 10-sided Polygon

1/10 of a 10 sided polygon

2/10 of a 10 sided polygon

Fractions of 10-sided Polygon

2/10 of a 10 sided polygon

3/10 of a 10 sided polygon

Fractions of 10-sided Polygon

3/10 of a 10 sided polygon

4/10 of a 10 sided polygon

Fractions of 10-sided Polygon

4/10 of a 10 sided polygon

5/10 of a 10 sided polygon

Fractions of 10-sided Polygon

5/10 of a 10 sided polygon

6/10 of a 10 sided polygon

Fractions of 10-sided Polygon

6/10 of a 10 sided polygon

7/10 of a 10 sided polygon

Fractions of 10-sided Polygon

7/10 of a 10 sided polygon

8/10 of a 10 sided polygon

Fractions of 10-sided Polygon

8/10 of a 10 sided polygon

9/10 of a 10 sided polygon

Fractions of 10-sided Polygon

9/10 of a 10 sided polygon

10/10 of a 10 sided polygon

Fractions of 10-sided Polygon

10/10 of a 10 sided polygon

10/10 of a 10 sided polygon with one piece detached

Fractions of 10-sided Polygon

10/10 of a 10 sided polygon with one piece detached

1/11 of a 11 sided polygon

Fractions of 11-sided Polygon

1/11 of a 11 sided polygon

2/11 of a 11 sided polygon

Fractions of 11-sided Polygon

2/11 of a 11 sided polygon

3/11 of a 11 sided polygon

Fractions of 11-sided Polygon

3/11 of a 11 sided polygon